JPS6238046Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a gear device that eliminates the bumpiness of the gear while suppressing an increase in the width of the gear, based on the fact that the sub-gear is installed in a groove provided on the outer periphery of the gear. Regarding.

For example, as illustrated in FIG. 11, parallel axes a,
A leaf spring-shaped sub-gear e having a different number of teeth from gear c is elastically pressed into contact with the end of one gear c of gears c and d meshing between gears b using a spacer f. By attaching it, a relative rotational movement is caused between gear c and sub gear e when meshing with the other gear d, and the friction force generated between them causes the play of the gears due to backlash between gears c and d. Japanese Utility Model Application Publication No. 109161/1983 has proposed a method that prevents the collision of decaying teeth and reduces noise. Furthermore, in Utility Model Application Publication No. 49-123479, the 12th
As shown in the figure, it has the same number of teeth as one gear c, and has slightly thicker teeth, and the inner hole g is designed to allow relative movement in the radial direction by meshing with the other gear d. A gear device is proposed in which a sub-gear e with play is brought into elastic contact with the end face of a gear c.
However, each of these has the disadvantage that the sub-gear e is attached to the end face of the gear b, and the attachment requires the spacer f, a retaining ring, a washer, etc., which increases the dimension in the longitudinal direction of the shaft.
Furthermore, as shown in FIGS. 13 and 14, in the gear train of the internal combustion engine, around the idle gear j, there are a gear k for driving the camshaft, a gear 1 for driving the injection pump, and a gear m attached to the crankshaft.
When arranging a plurality of gears k, l, m, etc., if the tooth width of each gear is approximately the same, in order to move sub-gear e relative rotationally, sub-gear e can be arranged as gears k, l, m, etc.
In addition, for convenience of attachment to each gear k, l, and m, the sub gear e is attached to the outward facing end face of the cylinder block w, and as a result, the idle gear j has a tooth width of The sub gears e mesh at the same position, causing a strong contact between the meshing portions n and increasing wear. In addition, while gears k, l, and m are usually helical gears, sub-gear e is often made of sheet metal punching, and is shaped like a spur gear, so it meshes at its corners, and idle gear j The disadvantage is that it promotes uneven wear.

The present invention aims to provide a gear device that can solve these problems, and one embodiment thereof will be described below with reference to the drawings.

In FIGS. 1 to 3, a gear device 1 has a groove 4 provided on the outer periphery 2a of one of the gears 2 meshing between parallel shafts, and a sub-gear 5 is attached in elastic contact with the groove 4. One gear 2 and the other gear 3 with which the gear 2 meshes are both made of, for example, helical gears, and the gears 2 and 3 are connected to a crankshaft and a camshaft, or a crankshaft and a balance shaft, etc., for example, an engine. Transmission is transmitted between parallel shafts 7 and 9 arranged parallel to each other.

One of the gears 2 consists of gear pieces 11 and 12 divided into two along a plane perpendicular to the center hole 10, and the gear piece 11 has a notch 4a on its outer periphery 2a with a depth exceeding the tooth bottom 2b. , the groove portion 4 can be formed by forming it on the side facing the gear piece 12 and by aligning it with the gear piece 12. The gear 2 has a half-moon key 14 that fits into the keyway 13.
By using the parallel shaft 17 to prevent rotation, the teeth traces of the gear pieces 11 and 12 can be aligned, and the parallel shaft 7
The gear 2 is fixed by appropriately clamping the gear pieces 11 and 12 using a nut fitting 16 between the stepped portion 15 provided in the gear 2 and the stepped portion 15 provided therein. Note that the tooth traces may be aligned using a dowel pin 17 as shown by the dashed line.

The sub gear 5 has a flat ring body punched out of a spring steel plate, and its inner hole 19 is connected to the bottom surface 4 of the groove portion 4.
It can be rotatably attached to b. Further, the sub-gear 5 has the same module as the gear 2, but has one more tooth, for example, and has an outer periphery 5a and a tooth bottom 5b due to dislocation.
is set to be almost the same as gear 2. Therefore, when the tooth tips of gear 2 and sub gear 5 are aligned at one position, for example, gear 2 is set at the opposite position.
The tooth tips of the sub-gear 5 are located in the tooth grooves of the sub-gear 5, and therefore, when meshing with the gear 3, the sub-gear 5 can make a relative rotational movement of one pitch during one rotation of the gear 2.
Furthermore, the sub-gear 5 is provided with a bent portion 23a that protrudes laterally at the bottom of the tooth bottom 5b, and its total width (W1) in its free state is made larger than the width (W2) of the groove portion 4. By forming the bent portion 23a, when attaching the sub gear 5 to the groove portion 4,
Constructing a spring means 23 that elastically deforms in a narrow width,
Therefore, the sub gear 5 can generate a frictional force with the gear 2 by coming into elastic contact within the groove 4 .

In the gear device 1, when the gears 2 and 3 mesh, the sub gear 5 is caused to undergo relative rotational movement as described above, thereby reducing the play due to backlash, alleviating the meshing impact, and reducing noise. Furthermore, since the sub-gear 5 is installed in the groove 4 provided on the outer periphery 2a of one gear 2, unlike the conventional gear device shown in FIG. There is no need to add parts for attaching the sub-gear e, and an increase in tooth width can be suppressed. Also, as in the above embodiment, the sub gear 5
When the spring means 23 is provided on the gear 2, the size can be further reduced, and the groove 4 can be formed at any position in the tooth width direction of the gear 2.
~ In the gears k, l, m illustrated in Fig. 14,
By changing the position of each groove part 4 in the tooth width direction, the meshing part n with the idler j is changed,
It is also possible to prevent uneven wear.

Note that the sub gear 5 is as illustrated in FIG.
It is curved into a wave spring shape, or formed into a disc spring shape as shown in FIG. 5, and furthermore, as shown in FIGS. The spring means 23 can also be formed on the sub-gear 5 itself by bending the protruding pieces 5e outward alternately.

Further, as shown in FIGS. 8 and 9, the groove 4 can be formed directly on the outer periphery 2a of the gear 2.
In such a case, in order to attach the sub gear 5 from its axial direction, for example, a split groove 29 is formed in a part of the tooth bottom 5b so that the sub gear 5 can be opened and inserted. Additionally, split groove 29
It is preferable to form a fitting groove 31 on one of the opposing ends and a bulging portion 30 with a convex tip on the other side to form a fitting portion 32 that fits into each other. It is also good to form it at the end on the side where compressive force is applied in meshing with 3. At that time, sub gear 5
Notches 33 and 34 are provided in the opening to increase the opening width and facilitate installation. Furthermore, as shown in FIG. 10, when the gear 2 is divided into two gear pieces 11 and 12, they are fitted together with a spigot to improve centering, and they are fixed and aligned using a dowel bolt 35. Therefore, it is possible to help align the tooth traces of the gear 2, and it is also possible to make the sub-gear 5 come into elastic contact with the sub-gear 5 by using a separate spring means 23, for example, a disc spring 23b, which is inserted into the groove 4. It can also be done.

As mentioned above, the gear device of the present invention has a groove on the outer periphery of the gear to insert the sub-gear, so there is no need for members such as retaining rings or washers on the end face of the gear to fix the sub-gear. As a result of reducing the space in the width direction, it is useful for downsizing the gear device, and also prevents uneven wear by freely changing the position of the groove when multiple gears are attached to one gear. It can have excellent effects such as moisturizing. In addition, in the gear device of the present invention, the gear specifications of the sub gear include those that cause relative rotational movement by changing the number of teeth, as well as those that cause relative rotational movement by changing the number of teeth.
49-123479, which allows relative movement in the radial direction by increasing the tooth thickness, as shown in Figure 12, which causes relative movement during meshing. Various mechanisms can be used as long as they are provided.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a front view illustrating a sub-gear, FIG. 3 is a sectional view thereof, FIGS. 4 and 5 are side views illustrating another example of a sub-gear, FIG. 8 is a sectional view showing another example of the gear, FIG. 9 is a front view showing still another example of the sub gear, FIG. 10 is a sectional view showing another embodiment, and FIG. 11 is a sectional view showing another example of the sub gear. 12 is a sectional view illustrating a conventional gear device, FIG. 13 is a front view illustrating a gear train, and FIG. 14 is a sectional view illustrating the meshing of gears in the conventional device in the gear train shown in FIG. It is a diagram. DESCRIPTION OF SYMBOLS 1...One gear, 2a...Outer periphery, 2b...Tooth bottom, 4...Groove portion, 5...Sub gear, 23...Spring means.

Claims (1)

[Scope of utility model registration request] One of the gears that meshes between the parallel shafts has a groove on the outer periphery with a depth exceeding the bottom of the tooth, and a flat plate-shaped gear that can move relative to the other gear by meshing with the other gear. A gear device in which a sub-gear made of a ring body is attached in elastic contact with the groove by a spring means.